On June 1, 2007, The Hollywood Reporter
announced that he would serve as executive producer and showrunner on Moonlight, a similarly
themed vampire detective show.[1] He later had to
leave the show prior to its debut for health reasons, but executive
producer Joel Silver
stated that his imprint would remain: "He worked really hard on the
arc of the series. He really helped us focus and get started". [2]

Greenwalt is credited with writing/directing the following episodes
of Buffy the Vampire Slayer

Greenwalt was a co-executive producer on Buffy until
the show's third season, when he was promoted to Executive
Producer. At the fourth season he dropped out to become the
executive producer of Angel, his co-created (with Whedon) sister show,
but he remained on the Buffy staff as a consulting
producer.

Greenwalt is credited with writing/directing the following episodes
of Angel

Greenwalt was one of the showrunners of Angel for three
out of its five seasons, with Joss Whedon. He left the staff in the
fourth season, but continued to receive an Executive Producer
credit through the shows run. He contributed frequently, even after
he left the show.

Greenwalt is best known as a writer on Buffy the Vampire Slayer and co-creator of its spinoff, Angel. He is also co-creator of the short lived television series Profit.

On June 1, 2007, The Hollywood Reporter announced that Greenwalt would serve as executive producer and showrunner on Moonlight, a new series that will debut on CBS in the fall of 2007.[1] He later had to leave the show before it was first aired for health reasons. Executive producer Joel Silver said that his name would remain: "He worked really hard on the arc of the series. He really helped us focus and get started"[2].